SU926214A1 - Drilling implement arrangement - Google Patents

Description

one

The invention relates to devices for directional drilling, designed to reduce the intensity of the curvature of wells when drilled with projectiles with removable core receiver.

Layouts of projectiles with removable core receivers are known, consisting of one diamond spreader, one carbide centering device, and four ribbon carbide surfacing on the core pipe. The disadvantage of these layouts is that the impurity part of the core | earns the borehole wall and does not contribute to keeping the well from being twisted; moreover, the projectile has insufficient rigidity of the core tube between the diamond expander carbide centering.

The closest technical solution is to assemble a drill bit for core sampling, which includes a rock destructive tool, pipe sections and three extender and centralizer rigidly connected to each other, with one pair of extender and centering device installed between the rock destructive tool and the lower pipe section. and the other two pairs are between the upstream sections of the pipes 23.

However, in the drilling process, the greatest effort to keep the well from curvature is perceived by the lower part of the assembly, the implementation of which with transient rigidity does not provide the necessary stability in its lower part.

The purpose of the invention is to reduce the spatial curvature of a well during drilling.

Claims (2)

This goal is achieved by the fact that the lower section t (the eub is made grinded with an odd number of edges. Fig. 1 shows the proposed layout of the drill string; Fig. 2 shows section A-A in Fig. 1. The layout of the drill shell consists of rock cutting tool 1, pairwise rigidly interconnected diamond expander 2 and carbide centralizer 3 and pipe sections connecting them, the lower of which is a shaped pipe, column pipe 5 and adapters 6 are located above. At least 3. The outer surface of the carbide centralizer 3, which is in contact with the borehole wall, is covered with wear-resistant carbide material. One pair of diamond spreader 2 and carbide centralizer 3 is installed above rock-breaking tool 1, and the remaining pairs between sections 4.5 and so on Profiled pipe is made with an odd number of faces. In the course of operation of the assembly, when drilling in hard rock, the centering element is diamonds, which simultaneously prevent the hard-alloy coating from premature wear. When drilling at weaker types, when diamonds actively work the borehole wall and do not keep the layout from being twisted, the carbide coating becomes the centering element. In order to reduce the effect of the bending moment of the drill string on the layout in its upper part, a third of a pair of carbide centering diamond reamer 3 enters into operation. Since the pipe is made with an odd number of edges, i.e. there is an edge against each face, which ensures maximum rigidity of the lower part of the layout. The technical and economic efficiency of the invention is to improve the quality of the well wiring. The invention The layout of the drill string, including rock cutting tool, pipe sections and at least three, pairwise rigidly interconnected centralizer and reamer, one pair of which is installed between the rock destructive tool and the lower pipe section, and above. False sections of pipes, characterized in that, in order to reduce the spatial curvature of the well during drilling, the lower section of pipes is made profiled with an odd number of faces. Sources of information taken into account in the examination 1. Drilling technology with projectiles with removable core receivers ССК-59. Methodical instructions. L., ONTI WITS, 1976, p. k5. 2. USSR author's certificate number 601388, cl. E 21 B 17/10, 1976 (prototype). I5 i R LD FIG. 2 D